Prof. Omar Ariel Fojón
Institute of Physics Rosario, UNR-CONICET, Rosario, Santa Fe, Argentina
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Academic Career Length
34Years (1993-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications21 January 2020 in Physical Review A
Journal Article
DBD. I. R. Boll
D. I. R. BollLML. Martini
L. MartiniOmar Ariel FojónAPA. Palacios
A. Palacios
We investigate a polarization control scheme in two-color two-photon atomic ionization. Experiments employing free-electron laser or high-order harmonic generation sources have shown light polarization dependencies in above threshold ionization of atoms assisted with an IR field. These were mostly performed at relatively high photoelectron energies where the soft-photon approximation remains valid. We use here a perturbation theory approach to show the larger degree of control that can be attained when the short wavelength photon energy is below the ionization threshold. This largely unexplored energy region offers unique possibilities to achieve polarization control of the reaction.
1 May 1993 in Physical Review A
Journal Article
GDGustavo Deco
Gustavo DecoOmar Ariel FojónJMJ. Maidagan
J. Maidagan
Roberto Daniel RivarolaDifferent aspects of relativistic distorted-wave models for electron capture in ion-atom collisions are analyzed. In particular, the nonrelativistic limit of the matrix continuum distorted-wave approximation is studied for reactions with or without change in the electron spin.
17 August 2017 in Papers in Physics
Journal Article
We theoretically study the photoionization of water molecules by high energy photon impact. We develop a model in which the final state wavefunction is given by a Coulomb continuum wavefunction with effective charges and the water molecule bound states are represented using the Moccia's monocentric wavefunctions. We obtain analytical expressions for the transition matrix element that enable the computation of cross sections by numerical quadratures. We compare our predictions for photon energies between 20 and 300 eV with more elaborated theoretical results and experiments. We obtain a very good agreement with experiments, in particular, at enough high energies where there is a lack of elaborated results due to their high computational cost. Received: 15 March 2017, Accepted: 25 June 2017; Edited by: S. Kais; DOI: http://dx.doi.org/10.4279/PIP.090006 Cite as: L Martini, D I R Boll, O A Fojón, Papers in Physics 9, 090006 (2017) This paper, by L Martini, D I R Boll, O A Fojón, is licensed under the Creative Commons Attribution License 3.0.
10 June 2021 in Journal of Physics B: Atomic, Molecular and Optical Physics
Journal Article
LMLara Martini
Lara MartiniDBDiego I R Boll
Diego I R Boll
APAlicia Palacios
Alicia PalaciosOmar Ariel FojónWe investigate different approximations in a polarization control scheme in two-color two-photon ionization by means of second-order time-dependent perturbation theory. Experiments revealed light-polarization dependencies in the above-threshold ionization of water molecules assisted by an IR field. These experiments were performed at photoelectron energies at which the soft-photon approximation exhibits discrepancies. We show that these discrepancies may be attributed to the coulombic nature of the scattering process for continuum–continuum transitions.
7 July 2026 in Physical Review A
Journal Article
1 April 2011 in Journal of Physics: Conference Series
Conference Paper
We analyze theoretically interference effects in the spectra of electrons emitted in the H2 photoionization by high energy linearly polarized photons. Molecular bound and continuum states are accurately described by means of B-spline basis allowing the inclusion of the nuclear degrees of freedom. One interesting feature is observed: the usual Franck-Condon behavior is not followed when the H2 internuclear axis is parallel to the polarization direction. Moreover, this is related to the fact that for this molecular orientation and under certain conditions, the electron cannot be emitted in the direction of the radiation field. On the contrary, for H2 molecules perpendicular to the polarization direction, the angular distribution of electrons is analogous to the one observed in the two slits Young's experiment.
About Me
I am researcher at the National Research Council of Argentina (CONICET) in the field of Atomic Collisions and Professor of Quantum Mechanics at the Universidad Nacional de Rosario (UNR). I obtained my PhD in Physics at the National University of Rosario (Argentina) in 1994. I entered the research career of CONICET in 1997. I worked at the Université de Metz (nowadays Université de Lorrane) in France (1995-2001) and Universidad Autónoma de Madrid in Spain (2002-2005) as invited Professor and researcher. I belong to the National Physics Association of Argentina and I am associate member by Argentina of the Commission on Atomic, Molecular, and Optical Physics (C15) of the International Union of Pure and Applied Physics. I am editor of the argentine scientific journal Papers in Physics and I am member of the International Advisory Committee of the International Symposium of Ion-Atom Collisions (ISIAC). My field of theoretical research includes positron impact on atoms and molecules, (e,2e) reactions, fast ion impact on atomic and molecular targets, basic reactions involving molecules of biological interest, two-center interferences in electron emission from molecules, photoionization and interaction of attopulses with atomic and molecular systems.
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